If f is a function of several variables, one calls a pair of variables substitutes (co.mp/ements) if the change of the value of the function when both variables are increased is at most (at least)â€¦ (More)

We survey some recent polynomial-time algorithms for the exact computation of network reliability. The algorithms apply to several classes of planar networks, which include series-parallel,â€¦ (More)

A minimal point disconnecting set S of a graph G is a nontrivial m-separator, where m=IS), if the connected components of G-S can be partitioned into two sets each of which has at least two points. Aâ€¦ (More)

The cornea of the urodele amphibian Triturus c. cristatus was studied ultrastructurally in order to provide the basis for a comparison among corneas throughout the vertebrate phylum. The cornea ofâ€¦ (More)

The effects of far ultraviolet light irradiation upon an amphibian cornea were studied to compare the effects observed both quantitatively and ultrastructurally with data obtained after UVâ€¦ (More)

A directed graph G with a source s and a sink r is called a p-graph if every edge of G belongs to an elementary (s,r)-path of G. If C is a cycle of the p-graph G then a cyclic cover of C is a set ofâ€¦ (More)